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United States Patent |
5,509,186
|
Straut
|
April 23, 1996
|
Bearing pusher
Abstract
A bearing pusher to remove a bearing from a shaft has a split anchor block
that can be placed over the shaft at any point desired. The split block is
then fixed together; and, a plurality of set screws engage the shaft or,
preferably, enter a groove in the shaft to hold the anchor block in place.
A split pusher block can be placed over the shaft between the anchor block
and the bearing, and the parts fixed together. Screws pass through
threaded holes in the anchor block and engage sockets in the pusher block,
so that rotation of the screws causes motion of the pusher block
longitudinally along the shaft.
Inventors:
|
Straut; Nelson F. (515 N. Hairston Rd., Stone Mountain, GA 30083)
|
Appl. No.:
|
348449 |
Filed:
|
December 2, 1994 |
Current U.S. Class: |
29/256 |
Intern'l Class: |
B23P 019/04 |
Field of Search: |
29/256,263,266,258,239,238,237,235
|
References Cited
U.S. Patent Documents
889315 | Jun., 1908 | Kenyon | 29/256.
|
1310806 | Jul., 1919 | Rollins | 29/256.
|
1587689 | Jun., 1926 | Weiss et al. | 29/256.
|
1930690 | Oct., 1933 | Oelkers | 29/256.
|
3174218 | Mar., 1965 | McConaha | 29/256.
|
4027373 | Jun., 1977 | Kwast et al. | 29/256.
|
4287653 | Sep., 1981 | Bloch | 29/256.
|
4304036 | Dec., 1981 | Blomgren | 29/256.
|
Primary Examiner: Watson; Robert C.
Attorney, Agent or Firm: Middleton; James B.
Claims
I claim:
1. A bearing pusher for urging a bearing off a shaft, said bearing pusher
comprising an anchor block defining an opening therein for receiving said
shaft therethrough, locking means for temporarily fixing said anchor block
to said shaft adjacent to said bearing, a pusher block defining an opening
therein for receiving said shaft therethrough, said pusher block being
positioned between said anchor block and said bearing, and pushing means
threadedly engaging said anchor block and in contact with said pusher
block for urging said pusher block towards said bearing, said anchor block
further including an upper member and a lower member defining a parting
line therebetween, said parting line being along a diameter of said
opening in said anchor block, and means for securing said upper member and
said lower member together, and, wherein said shaft defines a
circumferential groove, said anchor block being positioned at said groove,
and said locking means comprising at least one screw, a tip on said screw
being receivable within said groove.
2. A bearing pusher as claimed in claim 1, said pusher block further
including an upper member and a lower member defining a parting line
therebetween, said parting line being along a diameter of said opening in
said pusher block, and means for securing said upper member and said lower
member together.
3. A bearing pusher as claimed in claim 2, said pusher block including a
pusher ring carried by said pusher block for engaging said bearing.
4. A bearing pusher as claimed in claim 3, said pusher block defining
sockets thereon, said sockets being adapted to receive the extending ends
of said pushing means.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to bearing removal means, and is more
particularly concerned with a shaft-mounted apparatus for pushing a
bearing or the like off the shaft.
2. Discussion of the Prior Art
In removing a bearing or the like from a shaft, one of the most common
techniques is to utilize a bearing puller wherein a spindle engages the
end of the shaft, and hooked fingers engage the bearing. A screw then
urges the fingers rearwardly to pull the bearing off the shaft.
There are some bearings in which the end of the shaft is not accessible for
use of the conventional bearing puller. One such bearing is a front wheel
bearing of a front-wheel drive automobile. Such a bearing is splined to a
shaft, and a hub surrounds the bearing and mounts the stub shaft to carry
a wheel. Since the end of the shaft mounting the bearing is not
accessible, the conventional bearing puller is not usable. The
conventional method for removing such bearings is to drive the bearing off
the shaft with hammer blows. It is well known that one ought not to hammer
on a bearing; but, there has been no other means devised for removal of
the bearings. Thus, even manufacturer-trained mechanics hammer on the
bearing to remove it from the shaft.
SUMMARY OF THE INVENTION
The present invention provides a shaft-mounted pusher for gently urging a
bearing off a shaft. An anchor block is split to be placeable on a shaft
at any position desired, and a pusher block is also split to be placeable
on a shaft adjacent to the anchor block. The pusher block is placed
adjacent to the bearing to be removed, and pushing members threadedly
carried by the anchor block engage the pusher block and move it to move
the bearing.
The anchor block includes means for locking the anchor block with respect
to the shaft, while the pusher block is freely movable along the shaft.
The pusher block includes a pusher ring adapted to engage the bearing
being removed. The exact design of the pusher ring will be varied as
needed so the pusher ring will not engage the actual bearing race, but
will engage a sturdy portion of the bearing that can withstand the forces
involved.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features and advantages of the present invention will
become apparent from consideration of the following specification when
taken in conjunction with the accompanying drawings in which:
FIG. 1 is a side elevational view showing a shaft having a bearing thereon,
and showing a bearing pusher in cross-section mounted on the shaft in
position to remove the bearing;
FIG. 2 is a cross-sectional view taken along the line 2--2 in FIG. 1;
FIG. 3 is an elevational view, partially in cross-section, of the pusher
block shown in FIG. 1; and,
FIG. 4 is an enlarged, fragmentary view showing the pushing member and its
bearing member on the pusher block.
DETAILED DESCRIPTION OF THE EMBODIMENT
Referring now more particularly to the drawings, and to that embodiment of
the invention here chosen by way of illustration, FIG. 1 shows a shaft 10
having a bearing 11 thereon. The specific bearing 11 here shown is the
bearing for a front wheel of a front-wheel-drive vehicle. It will
therefore be seen that there is an apparatus 12 enclosing the bearing 11,
the apparatus 12 including a stub shaft 14 for receiving a wheel. Because
of the apparatus 12, it will be observed that the end of the shaft 10 is
not available for use of a conventional bearing or gear puller.
Conventionally, therefore, the bearing 11 is removed by hammering on the
bearing 11 to drive it off the shaft 10.
The device of the present invention is shown in place in FIG. 1 for urging
the bearing 11 off the shaft 10. It will be seen that there is an anchor
block 15 fixed to the shaft 10, and carrying at least one pushing member
16. There is a locking means 18 for selectively fixing the anchor block 15
to the shaft 10. Adjacent to the anchor block 15 there is a pusher block
19. The pusher block 19 is freely movable along the shaft 10, and includes
a pushing ring 20. Those skilled in the art will understand that the
pushing ring 20 will engage the bearing 11 in a manner not to damage the
bearings. The pushing ring 20 will preferably engage the rigid portion of
the bearing that receives the shaft 10, so the force to remove the bearing
will be applied directly rather than through the bearing races or the
like.
It should be noticed that the shaft 10 defines a groove 21
circumferentially thereof. Those skilled in the art will understand that a
rubber boot typically covers the area pictured, and the groove 21 receives
one end of the boot so the boot is retained in position. In the embodiment
of the invention here shown, the groove 21 is used in conjunction with the
locking means 18 to hold the anchor block 15 is the desired position
without damaging the shaft 10. This construction will be discussed in more
detail below.
Attention is now directed to FIG. 2 of the drawings. In this figure it can
be seen that the anchor block 15 comprises an upper member 22 and a lower
member 24. The parting line 25 between the upper and lower members 22 and
24 is preferably along a diameter of the opening 26 for receiving the
shaft 10. To hold the upper and lower members together, then, there are
two screws 28 and 29. The screws 28 and 29 pass through openings 30 and 31
in the upper member 22, and engage threaded holes 32 and 34 in the lower
member 24.
As is shown in FIG. 1, the pushing members 16 comprise threaded members
having a head 35 for engagement with a wrench or the like. The pushing
members 16 are threadedly engaged with the anchor block 15, one being on
one side, in the upper member 22, and the other being on the opposite
side, in the lower member. Rotation of the heads 35 will therefore cause
longitudinal movement of the pushing members 16.
The locking means 18 may take several different forms. It is well known
that one might use a conventional cup-pointed set screw or the like to
lock the anchor member 15 to the shaft 10. The locking means 18 here
illustrated is the preferred embodiment because a natural feature of the
shaft 10 is used for securely locking the anchor block 15 to the shaft 10
without marring the surface of the shaft. Thus, the locking means 18
includes four ball-pointed screws 35. The four screws 35 are spaced
circumferentially of the opening 26 in an effort to obtain uniform holding
of the block 15 and to prevent canting of the block. Those skilled in the
art will understand that a different number of screws 35 can be used. As
few as one screw will work quite well, and four provides good balance.
Virtually any number can be used if properly spaced for adequate holding
of the block.
With the above description in mind it will be understood that the screws 28
and 29 can be removed from the anchor block 15, and the upper and lower
members 22 and 24 can be separated. The two halves can then be placed on
opposite sides of the shaft 10, and the members reassembled using the
screws 28 and 29. The opening 26 will be of such a size that the upper and
lower members 22 and 24 can be pulled together snugly with the shaft 10
received within the opening 26.
With the anchor block 15 properly placed around the groove 21, the screws
35 will be rotated to move inwardly until the ball points are engaged
within the groove 21. Of course, if the shaft 10 does not have the groove
21, a pointed, or cup pointed set screw will be used to hold firmly to the
shaft.
Attention is now directed to FIG. 3 for a full understanding of the pusher
block 19. It will be seen that the pusher block also includes an upper
member 36 and a lower member 38 which separate along a line 39. The two
members are held together by screws 40 and 41. As in the anchor block, the
screws 40 and 41 pass through holes 42 in the upper member 36 and engage
threaded holes 44 in the lower member 38. The central opening 45 is
preferably sized so that, with the upper and lower members 36 and 38 held
snugly together, the pusher block 19 will still slide reasonably easily
along the shaft 10.
From the above discussion it will be understood that the pushing members 16
engage the pusher block 19 to urge it along the shaft. In view of the
forces involved, it is preferable to have sockets in the pusher block 19
to prevent lateral movement of the pushing members 16. Thus, the pusher
block 19 includes sockets 46 located to be aligned with the pushing
members 16.
FIG. 4 illustrates the preferred form of the tip of the pushing member 16
and the socket 46. The socket 46 is formed of a bearing material, and may
be a separate insert of material. The pushing member 16 is shaped to be
easily received within the socket 46, and to rotate therein. This
arrangement prevents lateral motion, or walking of the pushing member
during use.
It will now be clearly understood that the anchor block 15 will be fixed to
the shaft 10, and the pusher block 19 placed on the shaft between the
anchor block 15 and the bearing 11. Rotation of the pushing members 16
will cause them to engage the sockets 46 on the pusher block 19. Continued
rotation, then, will urge the pusher block against the bearing 11. Further
rotation of the pushing members 16 will urge the bearing off the end of
the shaft 10.
It will of course be understood by those skilled in the art that the
particular embodiment of the invention here presented is by way of
illustration only, and is meant to be in no way restrictive; therefore,
numerous changes and modifications may be made, and the full use of
equivalents resorted to, without departing from the spirit or scope of the
invention as outlined in the appended claims.
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